.web-game {
    width: 600px;
    margin: 0 auto;
}

.game-box {
    width: 508px;
    height: 560px;
    margin: 50px auto;
    background-image: url("../img/background.png");
    border: 1px solid transparent;
    background-repeat: no-repeat;
    position: relative;
}
.game-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    font-size: 0;
    margin-top: 90px;
}
.game-list li{
    width: 105px;
    height: 105px;
    border: 1px solid #ccc;
}

.win {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    display: none;
}
.step {
    text-align: center;
    margin-bottom: 20px;
}
.btns {
    text-align: center;
}
.btns button {
    margin: 0 20px;
    padding: 6px 10px;
}